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For the United States & Canada
cynipid - Druon quercuslanigerum

cynipid - Druon quercuslanigerum
Manteca, San Joaquin County, California, USA
Size: 1.5-2mm
Emerged at my house on February 1, 2008, from galls collected in November 2007. The galls were on Quercus virginiana, an oak not native to California and planted in a Manteca park. See this set of gall/leaf images.

Identified using Weld (1) and the help of Kathy Schick. Also, Kathy and some cynipid folks from Europe found more non-native Quercus virginiana trees on the San Joaquin Delta College campus (same county as these, different town) with the same galls!

Images of this individual: tag all
cynipid - Druon quercuslanigerum cynipid - Druon quercuslanigerum

I've been curious where the CA population came from and this wasp suggests it originated in the Texas subspecies. Your wasp is darker, consistent with the TX var fuscum and not the Florida var. quercuslanigerum, which looks more like this.

These galls are also in Los Angeles County
I am searching trees in Orange County, too.

LA County
Thanks James. I edited my web site to include LA County as a place it's been seen in CA. I assume the trees you saw these on are also Quercus virginiana?

Moved from Andricus laniger.
Current name is Andricus quercuslanigera, per Kathy Schick.

What a Great (& Patiently Developed) Story!
From the initial discovery of the galls by Beth Sands, through the notice and further work of Joyce, and the intermediate collaboration of the visiting cynipid experts, to the final successful rearing, emergence, and eventual ID of the wasp.

A testament to the unique potential and promise of BugGuide and it's community. Way to go Joyce and Beth! :-)